Ahmedabad: Ten-year-old Kashish Dhanani is nursing cuts and bruises from fighting off a ferocious German shepherd that attacked his 15-month-old sister Kanchi. Though a little shaken by the attack, the class 5 student is every bit the big brother.The youngster battled the dog for 10 minutes before his mother and passers-by came and rescued him and his sister. Miraculously, the toddler whom the dog attacked and even dragged around for some time did not suffer any injury.